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Optimum fertilization of hybrid poplar plantations in coastal British Columbia Zabek, Lisa M.

Abstract

The principles of optimum nutrition were examined in a short-rotation intensive-culture (SRIC) hybrid poplar plantation near Sayward, B.C. One-year-old SRIC hybrid poplar (Populus trichocarpa x P. deltoides) were fertilized with N or NPK applied once, in 3 equal additions, or in 3 incremental additions. Total loading rates were 225 kg N/ha, 75 kg P/ha and 75 kg K/ha. Height and diameter growth increased after fertilization, with NPK generally providing the best response after two growing seasons. Application timing did not affect growth. Two-year-old hybrid poplar were fertilized with N , NP, NPK or NPKS. Total loading rates were 225 kg N/ha, 75 kg P/ha, 75 kg K/ha and 15 kg S/ha. Height and diameter growth were highest after one growing season in trees fertilized with NPKS. One-month-old poplar stecklings were fertilized with 5 nutrient combinations (N, NK, NP, NKP or NKPCaMg) at 4 rates (0, 150, 300 or 450 kg N/ha). Loadings were based on 100N:70K: 13P:7Ca:7Mg. Biomass, leaf area and foliar nutrient concentrations were measured after 17 weeks. Foliar nutrient concentrations and contents increased after fertilization. Additional nutrients, in combination with N , increased steckling biomass, but application rate did not. Growth responses to 5 organic wastes and NPK fertilizer were compared in a second pot bioassay. Biomass, leaf area and foliar nutrient concentrations were measured after 17 weeks. The greatest growth response was to organic wastes, particularly fish-wood compost. Application of these results to SRIC hybrid poplar nutrition are discussed.

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